Truing device for valve-seats.



PATENTED MAY 22, 1906.

J. D. MITCHELL.

TRUING DEVICE FOR VALVE SEATS.

APPLICATION FILED Mums. 1904.

2 SHBETS SHEET No. 821,367. PATENTED MAY 22, 1906. J. D. MITCHELL.

TRUING DEVICE FOR VALVE SEATS.

APPLICATION FILED MAR. 26, 1904.

2 SHEETS-SHEET 2.

Fig. 8.

$04 6% w fliigxzml 0 y .dltarney.

. citizen of for the shaft will be fully and clear scribed and claimed, reference being had to 'ferred adaptation of the rIo.

' Specification of Letters resent. Application filed March 26, 1904. Serial No. 200,219.

.catented May as, race.

To ital/ 07L077? it mdy concern:

Be it known that I, JAMES D. MITCHELL, a the United States, residing at Lake.- wood, in the county of Cuyahoga and State of Ohio, have invented certain new and use- Improvements in Truing Devices for Valve-Seats, of which the following is a specification.

This invention relates to that class of tools or riggings which are used to retrue worn valve-seats.

The principal object of the invention is to provide a valve-seat-retruing rigging which can be attached to any ordinary pump or like device having a valve-seat requiring retruing and adjusted so as to be alined perfectly with the seat.

One of the features of the invention has ref- I, adjusting the truing" device from a true perpendicular to a slight inclination in any direction to perfectly aline the truing-blade with the'seat to be trued.

Another feature has reference to the spring device for pressing the truing-tool against the seat to be trued.

he invention also has reference to certain othernovel features or details ofconstruction, among which are a recessed holdingblock for the tool which is arranged so that the entire cuttin surface of the blade is exposed and a long tubular centering-support of the facin -tool,- all of which the accompanying drawings, in which a preinvention is shown. Figure '1 is a longitudinal section through the pumping-cylinder of a steam-pump, showing the. improved valve-seat-truing :device in operative position thereon. Fig. 2 is an enlarged central vertical section throu h the support for the truing device, showin tl ie' truing device set at a sh ht angle. ,ig. 3 is a viewsimilar to Fig. 2, s owing the truing device in a vertical osition. Fig. 4 is an enlarged detached centra vertical section through the split sleeve. Fig. 5is an enlarged detached side elevation of the split sleeve. Fig. 6 is an enlarged detached bottom plan view of the split sleeve. view of the linkwasher. Fig. 8 is an enlarged central vertical section through the truing device and-its support. Fig. -9 is an enlarged detached'end view of the recessed holding-blocks" -Fig.-10- is an enlarged detached side elevation of the recessed holdingcutting or grinding blades.

y hereinafter de- Fig. 7 is an enlarged detached block. Fig. 11 is an enlar ed detached bottom view of the recessed holding-block. Fig 12 is an enlarged detached top plan view of the vertical operatin rod or stem. Fig. 13 is an enlarged detached face view of one of the Fig. id is a sect1on on line a a, Fig. 13.. Fig. 15 is a detached plan view of the support for the truing device. Fig. 16 is an enlarged detachedtop plan view ofthe interiorl -screw-threaded clamp.

in referring to the drawin sfor the details of construction, like numera s designate like parts.

The verticall -extending shaft or stem 1: has its lower en 2 reduced and screw-thread ed, as shown in Fig. 8, and a recessed holdingblock formed as shown in Figs. 8, 9, 10, and 11 is provided with a screw-threaded opening in its top surface, into which the screwthreaded end2 of the shaft fits. The recessed holding-block has an upper tubular portion or hub 3, in which the screw-threaded opening is formed, and a rectangular-shaped lower holding or gripping portion 4, which is provided with a longitudinally-extending recess or depression 5. This recessedholding-block has a longitudinal cut or split 6, extending centrally through the grippingportion 4 an through the lower portion of the hub 3, and the separated parts of the gripping port on 4 are drawn to ether by means of two transversely-exten ing screwbolts 7.

The cutting or rinding blade 8 is formed substantially as sliown in Figs. 1 3 and 14 and is secured in place in the recessed block by fitting it into the recess or depression 5 and ti htening the screw-bolts 7, thus gr pping the blade 8 securely between the two parts of the gripping portion of the recessed block. The grinding-blade 8 has 1ts cutting edges arranged so as to face ter of the blade-that is, the cutting edges of one half of the blade are formed oplpositely to the cutting edges of the other ha 1 of the blade, as shown in Fi s. 13 and 14, and the angle of the cutting edges across the face of the blade ma be varied to suit difierent kinds of wor By forming the cutting edges of each half of the blade in opposite directions both halves of the blade are d- Ling while the blade is being rotated, W 'le if the cutting edges were formed in the same direction only one-half of the blade would be 'nding.

he f'vertical shaft or stem 1* is supported toward the cenare 7 opening sleeve 9, so as to rotate therein, and the tubular centering-sleeve 9 is adjustably supported in a split collar 10, which is formed integrally with an angular supporting-bar 1 1. (See Fig. 8.) The split collar 10 is provided with an 12 of larger diameter than the diameter of the sleeve 9, and said opening 12 is formed at a slight angle to the perpendicular, as shown in Fig. 15. A short split ring or sleeve 13, which has an outside diameter equal to the diameter of the opening 12, encircles the centering-sleeve Band is fitted into the opening 12. The opening 14 in this ring or sleeve 13 is also formed at a slight angle to the perpendicular, and the vertical split or cut 15 is formed therein in a position such that when it is alined with the split or cut 16 in the split collar 10 the tubular sleeve 9 and the shaft or stem 1 will extend in a true vertical direction. The split ring or sleeve 13 is provided with an annular flange 17 at its up-.

per end, which rests upon the top surface of the collar 10', and the sleeve 13 is locked to the tubular centering-sleeve 9 by a set-screw 18. (See Fig. 8.) The ring or sleeve 13 is also clamped tightly in the split collar 10 by means of a screw bolt 19, which screws through laterally-projecting ears on said collar 10. .(See Figs. 8 and 15.)

The lower end of the tubular sleeve 9 is ex teriorly screw-threaded, and a split tubular part 20, having a reduced lower opening through which the shaft 1 passes, is screwed upon the lower end of the sleeve 9, to which it'is clamped by means of a screw-bolt 2 1. The bolt 21 is screwed through openings in laterally-extending ears 22.

A washer 23 is placed upon the top surface of the tubular portion 3 of the recessed holding-block, and a spiral spring 24 encircles the lower end of-the shaft or stem 1 and is held in place by the interiorly-screw-threaded part 20 and the washer 23. (See Fi 8.)

The horizontal portion of the angu ar supporting-bar 11 is provided with an elongated opening or slot 25, through which a-bolt may be passed to secure the support to the pumpbody. (See Fig. 1.)

A split collar 26 is clamped around the upper'end of the shaft or stem 1 above the tubular centering-sleeve 9, so as to secure the shaft 1 in place in the sleeve 9.

The upper end 27 of the shaft 1 is ofsquare or other irregular'form in cross-section, and a bar or crank 28, which is provided with an opening or openings of similar form as the upper end 27 of the shaft 1, is fitted upon the end of the shaft 1 and forms a means for rotating said shaft. The bar or crank 28 may have a short handle 29 attached thereto, by which it may be rotated.

The shaft 1 has a slight up-and-down movement,which is provided for by the spiral sprin 24:, and by this means the blade 8 is presse upon the valve-seat with a spring tension.

It will be seen by referring that by loosening the screw-bolts 18 and 19 and turning the sleeve 13 the shaft 1 may be tilted at a slight angle to the perpendicular or may be adjusted to a true verticalposition, as shown in Fig. 8. The purpose of this is to provide for any slight irregularity in the surface to which the angular supporting-bar 11 is seto Figs. 2 and 3 cured, which, if the shaft 1 were secured in the collar 10 without means of adjustment, would cause the blade 8 to grind the valve-seat at an angle instead of at atrue horizontal plane.

A link washer 30 may, if necessary, be interposed between the angular supporting-bar 11 and the surface to which it is secured, as shown in Fig. 1, so as to raise the supportingbar 11 a sufficient distance from t e valveseat.

The operation is as follows: In truing the seat of a pump-valve similar to that shown in Fig. 1 the bonnet of the pump is removed and the device is attached thereto by securing a bolt through the slot 25 in the angular supporting-bar. The cutting-blade 8 is alined with the seat to be trued by the eccentric adjustment of the split collar 10 and sleeve 13 and is brought in contact with the face of the seat and then looked against anything but downward and rotating movement by tightening the screw-bolts 18 and 19. The shaft 1 is now rotated by means of the bar or crank 28 until the valve-seat is ground to a true surface.

I claim as my invention 1. In a, valve-seat-truing device, carrying a cuttin a stem tending therethrough at an an le to the periphery of said sleeve in which t e stem is rotatably mounted and a supporting-bar bolted to a suitable portion of the device having the seat to be trued and having a split collar provided with an opening extending therethrough at an angle to the periphery of said collar in which the centerin -sleeve is adjustably supported, substantial y as set forth.

2. A valve-seat-truing device having a vertical stem, a recessed holding-block on the 7 lower extremity of said stem, a cutting-blade supported by said holding-block, a centeringsleeve having an opening extending therethrough at an angle to the periphery of said sleeve in which the vertical stem is rotatably mounted, a su orting-bar bolted to a suitable portion 0 t e device having the seat to be trued and having a split collar formed integral with said bar and provided with an op en- -blade at its lower extremity, a centering-s eeve having an opening exing extending therethrough at an angle to the tion of the device having a seat to be trued and having a s lit collar provided with an opening forme at a slight angle to the perpendicular and of larger diameter than the diameter of the sleeve and a split ring fitting in the split collar and having an outside diameter equal to the diameter of the opening in t e split collar and an opening formed at a slight angle from the perpendicular in which the centering-sleeve is 'adjustably supported, substantially as set forth.

4. A valve-seat-truing device having a vertical stem, a recessed holding-block on thelower extremity of said stem,a cutting-blade supported by said holding-block, a centeringsleeve having an o ening formed at. a slight angle to the perpendicular in which the vertical stem is rotatably mounted, a supporting-bar y bolted to a suitable portion of the device l1aving the seat to be trued and having a split collar provided with an opening formed at a slight angle to the perpendicular in which the 'centering-sleeve is adjustably supported, substantially as set forth.

5. A valve-seat-truing device having a vertical stem, a recessed holding-block 011 the lower extremity of said stem, a cutting-blade supported by said holding-block, a centeringsleeve in which the vertical stem is rotatably mounted, a sup orting-bar bolted to a suitable ortion of t e device having a seat to be true and having a split collar provided with an opening formed at a slight angle to theperpendicular and of larger diameter than the diameter of the sleeve, a split ring having an outside diameter equal to the diameter of the opening in the split collar and an opening formed ata slight angle from the perpendicular in which the centering-sleeve is adjustably supported, substantially as set forth.

JAMES D. MITCHELL.

Witnesses:

A. J. SANGSTER,

GEo. A. NEUBAUER. 

